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On my past BMWs, I applied paint sealant to the shadowline trim pieces. It is a little harder than wax and provides some protection against surface scratches, plus it lasts for a few months.
A light polishing compound will remove scratches from shadowline pretty easily as noted.
You might try applying sealant or wax first to fill in the scratches. If they are still visible, then go the polishing route.
Charles
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT
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